Manchester United head scout Marcel Bout was in attendance as Red Bull Salzburg lost to Liverpool on Tuesday.
There were scouts from 40 different European teams at the Red Bull Arena for the Champions League clash and Sky Sports News understands that a large number of those scouts were there to watch 19-year-old Erling Haaland.
Haaland has been linked with a move to a number of top European clubs after scoring 28 goals in 22 games for the Austrian side this season.
United, Real Madrid, Barcelona, Juventus and Liverpool have all been linked with the 6ft 4in striker, who scored eight goals in six Champions League matches this season.
However, Sky Sports News understands that Haaland is also considering a proposal to stay affiliated to the RB group and join Bundesliga outfit RB Leipzig.
Before the game on Tuesday, which Liverpool won 2-0 to progress to the Champions League last 16, Jurgen Klopp described Haaland as "exceptional".
Klopp said: "He's 19 years old, exceptional player, but how would you defend a very good striker? Try to make sure that he gets not that many balls.
"Just a really big, big talent with a wonderful future, 100 per cent, but for tomorrow night, how you defend the best strikers, you try to avoid passes to them, you cut them out of the game and when they have the ball."
How to follow the January transfer window
Sky Sports will bring you the very latest news from the January transfer market with the return of three shows.
Start your day with Good Morning Transfers at 9am as our team of reporters bring you the latest news and insight. Transfer Talk then follows at midday delivering analysis of the biggest stories. Then join us at 7pm for the definitive round-up of the day's news with The Transfer Show.
Meanwhile, the Transfer Talk podcast will also be back at the turn of the year with more expert analysis from here and across the continent.
And as well as tuning into Sky Sports News, don't miss a thing with our dedicated Transfer Centre blog.